Genetic Variability in Phosphorus Responses of Rice Root Phenotypes

Rice

Table 6 The effects of genotype and phosphorus treatment on anatomical traits

	d.f.	RXSA (mm²)		TSA (mm²)		TCA (mm²)		TCA:RXSA Ratio		LCA (mm²)
		F	P	F	P	F	P	F	P	F	P
Genotype (G)	14	44.001	<0.001	27.366	<0.001	34.778	<0.001	2.695	0.003	14.034	<0.001
Treatment (P)	1	5.564	0.021	1.886	0.173	6.996	0.010	21.756	<0.001	17.178	<0.001
G * P	14	1.954	0.038	3.727	<0.001	2.041	0.029	1.429	0.168	3.001	0.002
Treatments		Mean	SE	Mean	SE	Mean	SE	Mean	SE	Mean	SE
HP		1.035	0.052	0.066	0.004	0.962	0.049	0.929	0.003	0.656	0.035
LP		0.876	0.043	0.074	0.004	0.796	0.039	0.908	0.004	0.477	0.026
Mean		0.955	0.035	0.070	0.003	0.879	0.033	0.919	0.003	0.566	0.024
	d.f	AA (mm²)		%AA		MXA (mm²)		MXV (counts)		WC (m⁴ · 10⁻²⁰)
		F	P	F	P	F	P	F	P	F	P
Genotype (G)	14	30.346	<0.001	4.225	<0.001	16.118	<0.001	50.071	<0.001	29.836	<0.001
Treatment (P)	1	0.241	0.625	26.059	<0.001	0.010	0.920	0.256	0.614	0.025	0.875
G * P	14	0.712	0.754	1.559	0.118	2.197	0.018	0.605	0.850	1.381	0.191
Treatments		Mean	SE	Mean	SE	Mean	SE	Mean	SE	Mean	SE
HP		0.306	0.018	31.837	0.918	0.00153	0.00008	5.49	0.195	162.209	21.298
LP		0.319	0.020	39.991	1.307	0.00155	0.00008	5.36	0.177	157.718	19.018
Mean		0.313	0.013	35.914	0.904	0.00154	0.00006	5.42	0.131	159.963	14.198

Analysis of variance, means and standard deviation (SE) values are shown for root cross-section area (RXSA), total stele area (TSA) total root cortical area (TCA), proportion of TCA, living cortical area (LCA), aerenchyma area (AA) and percent (%AA), median late metaxylem vessel area (MXA), number of late metaxylem vessels (MXV), and the water conductance (WC) in 15 O. sativa accessions evaluated under high (100 μM, HP) and low phosphorus (2 μM, LP) treatments